42666628 has 24 divisors (see below), whose sum is σ = 78926400. Its totient is φ = 20125728.

The previous prime is 42666623. The next prime is 42666629. The reversal of 42666628 is 82666624.

It is a super-2 number, since 2×42666628² = 3640882289780768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42666623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19401 + ... + 21487.

It is an arithmetic number, because the mean of its divisors is an integer number (3288600).

Almost surely, 2^42666628 is an apocalyptic number.

It is an amenable number.

42666628 is a deficient number, since it is larger than the sum of its proper divisors (36259772).

42666628 is a wasteful number, since it uses less digits than its factorization.

42666628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379 (or 2377 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 42666628 is about 6531.9696876210. The cubic root of 42666628 is about 349.4320803368.

The spelling of 42666628 in words is "forty-two million, six hundred sixty-six thousand, six hundred twenty-eight".